95 lines
2.2 KiB
Go
95 lines
2.2 KiB
Go
/*
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Copyright 2017 The Kubernetes Authors.
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Licensed under the Apache License, Version 2.0 (the "License");
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you may not use this file except in compliance with the License.
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You may obtain a copy of the License at
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http://www.apache.org/licenses/LICENSE-2.0
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Unless required by applicable law or agreed to in writing, software
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distributed under the License is distributed on an "AS IS" BASIS,
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WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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See the License for the specific language governing permissions and
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limitations under the License.
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*/
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// Package webhook checks a webhook for configured operation admission
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package webhook
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import (
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"strings"
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"k8s.io/api/admissionregistration/v1alpha1"
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"k8s.io/apiserver/pkg/admission"
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)
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type RuleMatcher struct {
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Rule v1alpha1.RuleWithOperations
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Attr admission.Attributes
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}
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func (r *RuleMatcher) Matches() bool {
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return r.operation() &&
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r.group() &&
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r.version() &&
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r.resource()
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}
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func exactOrWildcard(items []string, requested string) bool {
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for _, item := range items {
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if item == "*" {
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return true
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}
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if item == requested {
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return true
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}
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}
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return false
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}
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func (r *RuleMatcher) group() bool {
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return exactOrWildcard(r.Rule.APIGroups, r.Attr.GetResource().Group)
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}
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func (r *RuleMatcher) version() bool {
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return exactOrWildcard(r.Rule.APIVersions, r.Attr.GetResource().Version)
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}
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func (r *RuleMatcher) operation() bool {
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attrOp := r.Attr.GetOperation()
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for _, op := range r.Rule.Operations {
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if op == v1alpha1.OperationAll {
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return true
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}
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// The constants are the same such that this is a valid cast (and this
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// is tested).
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if op == v1alpha1.OperationType(attrOp) {
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return true
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}
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}
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return false
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}
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func splitResource(resSub string) (res, sub string) {
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parts := strings.SplitN(resSub, "/", 2)
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if len(parts) == 2 {
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return parts[0], parts[1]
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}
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return parts[0], ""
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}
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func (r *RuleMatcher) resource() bool {
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opRes, opSub := r.Attr.GetResource().Resource, r.Attr.GetSubresource()
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for _, res := range r.Rule.Resources {
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res, sub := splitResource(res)
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resMatch := res == "*" || res == opRes
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subMatch := sub == "*" || sub == opSub
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if resMatch && subMatch {
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return true
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}
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}
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return false
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}
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